Long method chaining inside a dictionary looks bad

[archiif]

Describe the style change

Break up and indent long method chaining inside a dictionary in a more readable way

Examples in the current Black style

How black breaks up method chaining in variable assignments:

value = (
    fn.chain()
    .chain()
    .chain()
    .chain()
    .chain()
    .chain()
    .chain()
    .chain()
    .chain()
    .chain()
    .chain()
)

How black does it with dictionary key assignments:

d = {
    foo: fn.chain()
    .chain()
    .chain()
    .chain()
    .chain()
    .chain()
    .chain()
    .chain()
    .chain()
    .chain(),
    bar: "value",
    more: "stuff",
}

Desired style

d = {
    foo: (
        fn.chain()
        .chain()
        .chain()
        .chain()
        .chain()
        .chain()
        .chain()
        .chain()
        .chain()
        .chain()
    ),
    bar: "value",
    more: "stuff",
}

or maybe:

d = {
    foo: fn.chain()
        .chain()
        .chain()
        .chain()
        .chain()
        .chain()
        .chain()
        .chain()
        .chain()
        .chain(),
    bar: "value",
    more: "stuff",
}

Additional context

[felix-hilden]

Hi, this is a duplicate of #620, we'll continue the discussion there!